From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Proposed modifications to the Phantom III braking system to overcome the loss of front braking and pedal movement.
| Identifier | ExFiles\Box 92\4\ scan0210 | |
| Date | 29th September 1936 | |
| TO Mr. Copy to Hs{Lord Ernest Hives - Chair}/Martindale. E/Ev.{Ivan Evernden - coachwork}6/MN.29.9.36. 306 Phantom III - Brakes. We wish to set out our proposals for overcoming the loss of front braking and pedal movement on the Phantom III, dividing the recommendations into classes according to their ability of being assimilated. Modifications to Existing Cars and Chassis Already Built. 1) It was agreed in conference between E.{Mr Elliott - Chief Engineer},Da.{Bernard Day - Chassis Design},L.A. and Srt/Turner that the operating lever on the front brake camshaft must be set in the off position almost touching the Hancock shoe. 2) The bolt bosses on the horizontal portion of the bell crank lever in the yoke piece shall be milled down as instructed, and the castle nut replaced by a lock-nut riveted over as shown on N.Sch.4904 already instructed. This modification should return to us the original travel shown on our brake scheme and on the production arrangement. 3) We are left with the difficulty of the rattling of the vertical pull rod. We have since seen that this may be overcome if the off stop on the front brakes is pressed not on the cam shaft lever but on the bell crank lever of the yoke piece. With this latter arrangement the pull-off springs of the front brakes ensure that there shall be a tension in the vertical ball-ended pull rod. The scheme also has the advantage that the setting of the brakes can be seen. We send herewith N.Sch.4915 showing the proposed stop which consists of a simple plate of steel attached by the studs holding the cap of the pivot pin. It is proposed to try this as a metal to metal stop but if clanking or knocks occur the stop can have a rubber, fibre or any other suitable face. Cont | ||